condition mean min max ZT0-3 27.9916 27.9916 27.9916 ZT4-7 51.2258 51.2258 51.2258 ZT8-11 26.4959 26.4959 26.4959 ZT12-15 16.23655 16.23655 16.23655 ZT16-19 11.92459 11.92459 11.92459 ZT20-23 18.574550000000002 18.574550000000002 18.574550000000002